Indeed, the MUX/input selection for this system will be very important, if we want to keep a tight handle on the time domain
Latency may be a concern.
Unrelated to this project, I am experimenting with a BOSS2 Player (allo.com). It introduces about 200 ms of audio delay running moOde/Debian on an RPi4 with 2 GB RAM.
I tested the Toslink and analog inputs of this soundcard using Alsa arecord/aplay commands to bypass moOde and DSP: (Amazon.com: VAlinks USB 2.0 External Sound Card 6 Channel 5.1 Surround Optical S/PDIF Audio Sound Card Adapter for PC Laptop Recording Compatible with Windows 10/8 / 7/ XP: Computers & Accessories)
I also tested AirPlay through moOde by streaming the audio of test videos: (17) Audio Video Sync Test - YouTube .
So far I've found the same 200 ms latency regardless of input source or pipeline in use.
I will try to isolate the cause when I have time for further testing.
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